Intersymbol interference channel coding scheme

Details Intersymbol interference channel coding scheme Intersymbol interference channel coding scheme

1993-06-14

1996-01-30

O'Shea, Sandra L.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375341, 371 43, H04L 512, H04L 2534

Patent

active

054886333

ABSTRACT:
Intersymbol interference and precoding loss are minimized by combining the precoding and coding operations. An intersymbol interference coder uses a feedback loop to apply a dither sequence to a sequence of input signal points. The dither signal applied to each input signal point is a function of the previous signal points in the sequence. The intersymbol interference coder implements, for example, a trellis coding operation by selecting one of several different modulo operations to determine the magnitude of the dither signal, the selection being made in response to the current trellis state. The sequence of signal points output from the intersymbol interference coder generates a valid sequence of the trellis code input to the Viterbi decoder.

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R. Laroia, et al., "A Simple & Effective Precoding Scheme . . . " IEEE Trans. on Communicationa, vol. 41, No. 10, Oct. 1993.
R. Laroia, "On Optimal Shaping of Multidimensional Constellations . . . ", U. of Maryland TR 92-1, Jan. 1992, Technical Research Report.
General DataComm, Inc. Contribution to CCITT Standards Mtg. on V.FAST Standard, Jan. 1992.

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